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Niners rookie linebacker Cam Johnson is expected to be back for training camp after undergoing a minor surgical procedure. (SFGate)

After rolling the dice with one backup outside linebacker on the roster last year, the 49ers addressed the area in the draft by selecting Notre Dame’s Darius Fleming and Virginia’s Cam Johnson in the fifth and seventh round, respectively.

Just over a month later, however, both rookies are sidelined with injuries.

Jim Harbaugh revealed today that Johnson, who was practicing last week, has undergone a minor “clean out” procedure, but will be back for training camp. Johnson was not at practice today. The news comes after Fleming suffered an ACL injury during last month’s rookie minicamp which is expected to sideline him for the season.

Harbaugh did not confirm Johnson had a surgical procedure on his knee, but Johnson dealt with a knee injury throughout his senior season at Virginia. In reporting this story on Johnson, both Cavaliers head coach Mike London and defensive coordinator Jim Reid told me Johnson’s knee injury limited his explosion. Johnson had 30 tackles and four sacks as a senior after posting 53 tackles and 6.5 sacks in 2010.

Reid said Johnson cried during pregame warmups last year when his injury prevented him from playing against Idaho. He underwent an MRI as a senior and London and Reid both referred to the injury as a deep bruise.

“He had to get a procedure done,” Harbaugh said. “It’s nothing major, kind of a clean out. He’ll be back for training camp, 100-percent full-go. We felt it was better to do it now. And I think our doctors are right to do it. I think this will benefit Cam and he’ll be able to put his best foot forward come training camp … I think it was hindering him early in OTAs and minicamps.”

The 49ers’ outside linebackers include starters in Ahmad Brooks and Aldon Smith and their primary backup, Parys Haralson. Other outside linebackers on the roster include the well-traveled Eric Bakhtiari and undrafted free agent Koutnei Brown.

Bakhtiari, 27, played for Harbaugh at the University of San Diego and has since spent time on the practice squad of seven NFL teams, including two stints with the 49ers (2008, ‘10). Bakhtiari had six special-teams tackles in three games with the Titans in 2009, the only games of his NFL career.